C++
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Date and time using
header - decltype
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C++ Fold Expressions Binary Folds
Example
Binary folds are basically unary folds, with an extra argument.
There are 2 kinds of binary folds:
-
Binary Left Fold -
(value op ... op pack)- Expands as follows:(((Value op Pack1) op Pack2) op ...) op PackN -
Binary Right Fold
(pack op ... op value)- Expands as follows:Pack1 op (... op (Pack(N-1) op (PackN op Value)))
Here is an example:
template<typename... Ts>
int removeFrom(int num, Ts... args)
{
return (num - ... - args); //Binary left fold
// Note that a binary right fold cannot be used
// due to the lack of associativity of operator-
}
int result = removeFrom(1000, 5, 10, 15); //'result' is 1000 - 5 - 10 - 15 = 970
